Modern JavaScript from the Beginning - Second Edition - Event Bubbling

The video tutorial explains the concept of event bubbling in JavaScript, where an event triggered on an element propagates up through its parent elements. The instructor demonstrates how to add event listeners to elements and shows how events bubble up the DOM tree. The tutorial also covers the stop propagation method, which prevents events from bubbling up, and briefly introduces event delegation as a topic for the next video.

What is event bubbling in the context of JavaScript?

• A process where events are captured from the outermost element to the innermost.

• A process where events are handled by the element that triggered them only.

• A process where events move up the DOM tree, triggering parent event listeners.

• A process where events are prevented from reaching their target element.

In the demonstration, what happens when you click the button?

• Only the button's event listener is triggered.

• The button's event listener is triggered, and then it stops.

• The button's event listener is triggered, followed by its parent's listener.

• The button's event listener is ignored.

What is the result of clicking the form in the demonstration?

• The form's event listener is triggered, followed by the division's and button's listeners.

• Only the form's event listener is triggered.

• The form's event listener is ignored.

• The form's event listener is triggered, and then it stops.

What is the purpose of the stopPropagation method?

• To stop the event from propagating to parent elements.

• To prevent events from triggering any event listeners.

• To trigger all event listeners on the page.

• To allow events to bubble up the DOM tree.

When should you use the stopPropagation method?

• To make sure the event is ignored by all elements.

• To ensure all parent elements handle the event.

• Only when you have a specific reason to stop the event from reaching parent elements.

• Whenever you want to prevent any event from occurring.

What does the stopImmediatePropagation method do?

• It stops the event from reaching any parent elements.

• It stops the event from triggering any other event listeners on the same element.

• It ensures the event is handled by the document body.

• It allows the event to trigger all event listeners on the element.

What is the difference between stopPropagation and stopImmediatePropagation?

• stopPropagation stops the event for all elements, while stopImmediatePropagation stops it for the current element only.

• stopPropagation stops the event from reaching parent elements, while stopImmediatePropagation stops it for all handlers on the current element.

• stopPropagation allows the event to continue, while stopImmediatePropagation stops it completely.

• There is no difference; they perform the same function.